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IRSHAD
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Gasket Compression Calculation for a Known Load

09/08/2019 10:43 AM

I want to calculate gasket compression for a known load. Gasket is spiral wound, ss304 with graphite filled. All dimensions of gasket are known. Or else, if compression is known, calculate load on gasket. Neglect internal pressure.
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SolarEagle
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#1

Re: Gasket compression calculation for a known load

09/08/2019 8:22 PM

You have your load and area of contact. but you need to know the compression characteristics of the gasket and the internal load...

https://www.garlock.com/sites/default/files/files/technical_articles/Initial%20Gasket%20Compression.pdf

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PWSlack
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#2

Re: Gasket Compression Calculation for a Known Load

09/09/2019 3:01 AM

One cannot neglect internal pressure, as it has an effect on the tension in the bolts, which has an effect on the pressure in the gasket.

"Nurse! The screens!"

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PWSlack
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#3

Re: Gasket Compression Calculation for a Known Load

09/09/2019 4:23 AM

It must exceed the pressure in the pipe, otherwise the joint will leak.

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Codemaster
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#4

Re: Gasket Compression Calculation for a Known Load

09/09/2019 5:08 AM

ASME VIII contains detailed flange/gasket calculations.

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PWSlack
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#5
In reply to #4

Re: Gasket Compression Calculation for a Known Load

09/09/2019 6:24 AM

...which means that there is no need to carry out a <...Calculation...>.

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Codemaster
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#6
In reply to #5

Re: Gasket Compression Calculation for a Known Load

09/09/2019 10:43 AM

Not with you there. I don't have ASME VIII with me, but I have an old vrsion of BS5500, which has a similar flange design procedure. I would guess the latest Euronorm has something similar. There are quite a few calculations to arrive at inputs to the Suggested working form.

That's for the complete flange and gasket design. Not clear just what the OP is after, but I doubt it's as simple as him knowing the total bolt load, as in that case the gasket stress is easy to work out. But it's still a calculation.

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IRSHAD
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#7

Re: Gasket Compression Calculation for a Known Load

09/10/2019 3:58 AM

Can we use stress strain relation . Is there any approximate Young's modulus value that can be used int this relation. Gasket is spiral wound, ss304 with graphite as filler.
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PWSlack
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#8
In reply to #7

Re: Gasket Compression Calculation for a Known Load

09/10/2019 6:28 AM

<...Gasket is spiral wound, ss304 with graphite as filler....>

That was already stated in the Original Posting to this thread.

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PWSlack
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#9
In reply to #7

Re: Gasket Compression Calculation for a Known Load

09/10/2019 6:41 AM

A1) The capabilities of correspondents are not in the domain of this forum to judge.

A2) Yes.

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Codemaster
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#10
In reply to #7

Re: Gasket Compression Calculation for a Known Load

09/10/2019 6:48 AM

In a spiral wound gasket the section of each "wire" is likely to be chevron-shaped. Using beam-bending theory you could estimate the stress/strain relationship. It will be much smaller than the Young's modulus of the 304SS material.

But why do you need to know? For eg a 3mm thick gasket the compression will be small, even for a large stress.

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PWSlack
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#11

Re: Gasket Compression Calculation for a Known Load

09/10/2019 7:09 AM

See #4⇑.

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